Yes dude - try some trimix instead and stay safe. The fact that you dove down to 60m before is not an argument to pull it further down by 20m. At 60m you are just within the max limit of oxygen toxicity for air but deeper - apart from getting totally narked, at that depth you are well above the max oxygen toxicity level and can pass out without even noticing it - not to mention the deco time you will have to do if making it to the surface...
Really, this sounds rather as a stunt and not a dive...but good luck and let us know how narked you got!
serge
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